I think the easiest way to get a 400 characters from a file is with
.comb() on the file.

   'example.txt'.IO.comb(400).head()
On Sun, Oct 7, 2018 at 6:42 PM ToddAndMargo via perl6-users
<perl6-users@perl.org> wrote:
>
> Hi All,
>
> I use `slurp` all the time, so of course, I can't
> make heads or tails out of
>
>       https://docs.perl6.org/routine/slurp
>
> I want to slurp the first 400 characters of
> a file and close the handle.  Am I missing a
> `so many` parameter somewhere?
>
> Many thanks,
> -T

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